Lubrication System (Engine); Filling Oil Sump; Recommended Lubricating Oils - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
2-50. LUBRICATION SYSTEM (ENGINE).
2-51. SERVICING SYSTEM. The engine oil level should be checked before each flight and changed after
each 50 hours of engine operation. During oil change, the oil screen(s) should be removed and cleaned, and
the oil filter cartridge replaced. Intervals between oil changes can be increased as much as 100% provided
the element is replaced each 50 hours of operation. The engine manufacturer does not recommend oils by
brand names. Use a quality brand Aviation Grade Oil of the proper season viscosity. For more information
on recommended oils refer to the latest revision of Lycoming Service Instruction Letter No. 1014 and
Lycoming Service Bulletin No. 318.
CAUTION
Do not introduce any trade additive to the basic lubricant unless
recommended by the engine manufacturer.
2-52. FILLING OIL SUMP. The oil sump should normally be filled with oil to the 12 U.S. quart mark on
the engine dipstick. The specified grade of oil may be found in Table II-IV, the lubrication chart or on each
engine oil filler access door. To service the engine with oil, open the quick release access door on top of the
cowl and remove the oil filler cap.
NOTE
Oil dipsticks are marked for right and left engines. Use the correct
side of stick when checking oil level.
TABLE II-IV. RECOMMENDED LUBRICATING OILS
SINGLE
VISCOSITY
SAE 50
SAE 40
SAE 30
SAE 20
MULTI
VISCOSITY
SAE 40 or 50
SAE 40
SAE 40 or 20W-30
SAE 20W-30
AVERAGE AMBIENT
AIR TEMPERATURE
Above 60 F (10 C)
30 F to 90F (-1 °C to 32C)
0 F to 70 F (-17 C to 20C)
Below 10F (12 C)
OIL INLET TEMPERATURE
DESIRED
MAXIMUM
180 F(80 C)
245F (118°C)
180F (82 C)
245F (118 C)
170F (77 C) 225F (107 C)
160F (71 C)
210 F( 99 C)
2-53. DRAINING OIL SUMP. To drain the oil sump provide a suitable container with a minimum capacity
of 12 quarts. Remove the engine cowl and open the oil drain valve located on the underside of the engine
by pushing the arms of the drain up and turn counterclockwise. This will hold the drain in the open
position. It is recommended the engine be warmed to operating temperature to insure complete draining of
the old oil.
Revised: 3/11/81
HANDLING AND SERVICING
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